单项选择题

For some time now, Eric ______ for foreign trade.

A．had been working
B．was working
C．has been working
D．worked
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单项选择题
Sarah says that she will visit us in the summer but I can't ______ her ______ to a definite date.
A．nail... down
B．tie... up
C．pin... on
D．fasten... in
单项选择题
I'd sooner they ______ invent the lethal weapon.
A．didn't
B．won't
C．don't
D．can't
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